skeleton key

== English == === Noun === skeleton key (plural skeleton keys) A very simple design of key that usually has a cylindrical shaft (sometimes called a "shank") and a single, minimal flat, rectangular tooth or "bit". A key that has parts filed away so that it will open a range of locks. A master key. (figurative) A key (A crucial step or requirement) or (An idea, theory or observation that explains, justifies or renders (something) comprehensible). ==== Translations ==== ==== See also ==== passkey